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Peningkatan produktivitas kerja di usaha kecil pada Dusun Ambung, Desa Masbagik Timur, Kecamatan Masbagik, Kabupaten Lombok Timur Syarif Hidayatullah; Syahrul Syahrul; I Dewa Ketut Okariawan; Salman Salman; Agus Dwi Catur; Suteja Suteja; Ahmad Akromul Huda
SELAPARANG: Jurnal Pengabdian Masyarakat Berkemajuan Vol 10, No 3 (2026): June
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/jpmb.v%vi%i.39007

Abstract

AbstrakUsaha kecil di Dusun Ambung, Desa Masbagik Timur, masih menghadapi kendala efisiensi produksi akibat penggunaan alat tradisional dalam pengolahan keripik singkong. Proses pemotongan singkong secara manual membutuhkan waktu lama, menghasilkan irisan yang kurang seragam, dan meningkatkan risiko cedera kerja. Kegiatan pengabdian ini bertujuan meningkatkan produktivitas kerja mitra melalui penerapan alat pemotong singkong berbasis teknologi tepat guna. Metode kegiatan meliputi observasi lapangan, persiapan dan perakitan alat, sosialisasi penggunaan alat, edukasi manfaat teknologi, serta serah terima alat kepada mitra usaha kecil. Seluruh tahapan dilakukan secara partisipatif agar mitra dapat memahami, menggunakan, dan merawat alat secara berkelanjutan. Hasil kegiatan menunjukkan bahwa penggunaan alat pemotong singkong meningkatkan kapasitas pemotongan dari 8–10 kg/jam pada metode manual menjadi 22–26 kg/jam setelah alat digunakan, atau sekitar 2,4–2,8 kali lebih tinggi. Waktu pemotongan untuk 10 kg singkong juga berkurang dari sekitar 60–75 menit menjadi 23–27 menit. Selain itu, hasil irisan menjadi lebih seragam, kebutuhan tenaga kerja berkurang, dan risiko cedera saat produksi dapat diminimalkan. Program ini menunjukkan bahwa inovasi sederhana berbasis teknologi tepat guna dapat meningkatkan efisiensi, produktivitas, dan daya saing usaha kecil pengolahan singkong. Kata kunci: usaha kecil; alat pemotong singkong; teknologi tepat guna; produktivitas; Dusun Ambung. AbstractSmall businesses in Ambung Hamlet, Masbagik Timur Village, still face production efficiency challenges due to the use of traditional tools in cassava chip processing. The manual cassava cutting process is time-consuming, produces uneven slices, and increases the risk of workplace injuries. This community service activity aims to improve the productivity of small business partners through the implementation of cassava-cutting tools based on appropriate technology. The activity methods include field observations, tool preparation and assembly, training on tool usage, education on the benefits of the technology, and the handover of tools to small business partners. All stages were conducted in a participatory manner so that partners could understand, use, and maintain the tools sustainably. The results of the activity show that the use of the cassava cutting tool increased cutting capacity from 8–10 kg/hour using manual methods to 22–26 kg/hour after the tool was used, or approximately 2.4–2.8 times higher. The cutting time for 10 kg of cassava also decreased from about 60–75 minutes to 23–27 minutes. In addition, the slices became more uniform, labor requirements were reduced, and the risk of injury during production was minimized. This program demonstrates that simple innovations based on appropriate technology can improve the efficiency, productivity, and competitiveness of small cassava processing businesses. Keywords: small business; cassava cutting tool; appropriate technology; productivity; Ambung Hamlet.
MOLECULAR ADSORPTION OF ZEA MAYS LEAF PHYTOCHEMICALS ON Fe(110) AS CORROSION INHIBITORS: DFT AND MONTE CARLO STUDY Syarif Hidayatullah; Suteja Suteja
Scientific Journal of Mechanical Engineering Kinematika Vol 11 No 1 (2026): SJME Kinematika June 2026
Publisher : Mechanical Engineering Department, Faculty of Engineering, Universitas Lambung Mangkurat

Show Abstract | Download Original | Original Source | Check in Google Scholar

Abstract

Plant-derived compounds have attracted increasing attention as environmentally friendly corrosion inhibitor candidates. However, the molecular adsorption behavior of selected phytochemicals from Zea mays leaves on iron surfaces remains insufficiently understood. This study investigates ethyl palmitate (EP), hexadecanoic acid (HA), and 9,12,15-octadecatrienoic acid (OA), identified from Zea mays leaf extract, as potential inhibitors for the Fe(110) surface. Density Functional Theory (DFT) calculations at the B3LYP/6–311G(d,p) level were used to evaluate global and local electronic descriptors, including frontier molecular orbital energies, energy gap, dipole moment, hardness, softness, electronegativity, electron transfer tendency, Mulliken charge distribution, electrostatic potential, and Fukui indices. Monte Carlo simulations were performed to examine the adsorption behavior of these molecules on Fe(110) in the presence of water molecules. The DFT results showed that OA had the smallest energy gap and the highest softness, indicating the strongest electronic reactivity among the studied molecules. In contrast, EP exhibited the strongest adsorption affinity in the Monte Carlo simulation. The calculated differential adsorption energies for EP, OA, and HA were −203.32, −192.71, and −189.69 kcal/mol, respectively, indicating favorable adsorption on Fe(110). Oxygen-containing functional groups were identified as the main reactive sites involved in molecule–surface interactions. The main contribution of this work is the molecular-level comparison of selected Zea mays leaf phytochemicals on Fe(110) using combined DFT and Monte Carlo approaches. The results suggest that EP and OA are promising green corrosion inhibitor candidates, although experimental validation is required to confirm their inhibition efficiency under practical corrosive conditions.
THE USE OF KAPOK SEED AGRICULTURAL WASTE AS A SOURCE OF NATURAL CORROSION INHIBITOR FOR ALUMINUM 6061 Syarif Hidayatullah; Ahmad Akromul Huda; Suteja Suteja
Protech Biosystems Journal Vol 5, No 2 (2025): Protech Biosytem Journal (Desember)
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/protech.v5i2.35784

Abstract

Aluminum 6061 is one of the most widely used materials across various industrial sectors due to its good mechanical properties, lightweight nature, and corrosion resistance. However, in acidic environments, aluminum remains susceptible to corrosion, which can reduce its performance and service life. This study utilizes agricultural waste from kapok seeds (Ceiba pentandra) as an environmentally friendly corrosion inhibitor for Aluminum 6061. The extract was obtained through maceration using ethanol as the solvent and was applied in corrosion tests of Aluminum 6061 in 1 M HCl solution. The evaluation was conducted using potentiodynamic polarization (PDP) and electrochemical impedance spectroscopy (EIS) techniques, along with isothermal adsorption analysis to understand the adsorption mechanism of the inhibitor on the metal surface. The results showed that the kapok seed extract significantly increased polarization resistance and reduced the corrosion rate, achieving a maximum inhibition efficiency of 78.77% at an optimal concentration of 3000 ppm. The inhibitor adsorption followed the Freundlich isotherm model, indicating strong binding interactions between the inhibitor molecules and the aluminum surface. Therefore, kapok seed extract has great potential as an environmentally friendly and cost-effective corrosion inhibitor for aluminum-based industries.
Utilization of Pumpkin seed waste extract as an inhibitor in reducing the corrosion rate on metals Syarif Hidayatullah; Nasmi Herlina Sari; Ahmad Akromul Huda; Maharsa Pradityatama; Sinarep Sinarep; suteja suteja
Protech Biosystems Journal Vol 5, No 1 (2025): Protech Biosystem Journal
Publisher : Universitas Muhammadiyah Mataram

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.31764/protech.v5i1.32116

Abstract

Our research focuses on enhancing the potential of pumpkin seed waste extract as a sustainable corrosion inhibitor for metal (Fe) in 1 M HCl solution. Phytochemical screening and antioxidant activity were identified. Various investigative methodologies including experimental techniques such as Potentiodynamic Polarization (PDP) were used to evaluate the effectiveness of these pumpkin seed waste extract inhibitors in inhibiting corrosion. Electrochemical results showed that the effectiveness of the inhibitor was concentration dependent here reaching 83.11% at 3000 g/L pumpkin seed waste extract inhibitor. The PDP showed that the mixed inhibition control effectively retarded the corrosion of the metal. Furthermore, the adsorption behavior of the pumpkin seed waste extract inhibitor onto the metal follows the Langmuir isotherm model with physisorption properties. The adsorption mechanism of the inhibitor on the metal surface successfully formed a protective film on the metal surface thereby reducing the corrosion rate.  
Characteristics of bio-composites from Polyvinyl alcohol reinforced micro-cellulose fibers of Paederia foetida Nasmi Herlina Sari; Muhammad Nabil Fadhlurrohman Rivlan; Suteja Suteja; Syarif Hidayatullah; I Putu Lokantara
Journal of Fibers and Polymer Composites Vol. 5 No. 1 (2026): Journal of Fibers and Polymer Composites
Publisher : Green Engineering Society

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.55043/jfpc.v5i1.576

Abstract

The use of renewable natural fibers as reinforcements in biodegradable matrices has been boosted by the development of sustainable polymer materials. The purpose of this work is to examine the properties of bio-composites made of polyvinyl alcohol (PVA) reinforced with micro-cellulose fibers that are isolated from the underused plant resource Paederia foetida (MSPf). After retting and alkaline and bleaching treatments, micro-cellulose was obtained and added to PVA at a weight percentage of 5% utilizing the solution casting technique. The biocomposites' mechanical, thermal, water absorption, and morphological characteristics were assessed. When MSPf was added, PVA's tensile strength rose from 20.69 MPa to 23.10 MPa, and its elastic modulus increased dramatically, suggesting better stiffness and efficient stress transfer. The improvement is ascribed to the hydroxyl groups of PVA and cellulose having strong hydrogen bonds and good interfacial adhesion. Due to limited polymer chain mobility, elongation at break decreased, but the composite showed better structural integrity. After 36 h, water absorption attained an equilibrium value of 1.461%, indicating the creation of a compact fiber-matrix network. When compared to clean PVA, thermogravimetric analysis showed better thermal stability, and SEM verified strong interfacial compatibility and homogeneous dispersion. These results show that micro-cellulose derived from Paederia foetida is a viable sustainable reinforcement that can improve the performance of bio-composites based on PVA.